JPS6392976A - Developing device - Google Patents

Developing device

Info

Publication number
JPS6392976A
JPS6392976A JP23888986A JP23888986A JPS6392976A JP S6392976 A JPS6392976 A JP S6392976A JP 23888986 A JP23888986 A JP 23888986A JP 23888986 A JP23888986 A JP 23888986A JP S6392976 A JPS6392976 A JP S6392976A
Authority
JP
Japan
Prior art keywords
bottom plate
developing
developer
intersecting point
roller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP23888986A
Other languages
Japanese (ja)
Inventor
Toyoyoshi Aimoto
豊賀 相本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sharp Corp filed Critical Sharp Corp
Priority to JP23888986A priority Critical patent/JPS6392976A/en
Publication of JPS6392976A publication Critical patent/JPS6392976A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To prevent a developer from being stagnated under a developing roll by positioning a central line intersecting point to be an intersecting point between a developing roll central line passing a releasing pole of a developing roll and the bottom plate of a developing tank on the stirring roll side from an intersecting point between the shape lines of the tank buttoms of the developing and stirring rolls. CONSTITUTION:The intersecting point between the central line C expanding radially from the developing roll 5 and passing the center of the releasing pole F and the buttom plate 11a of the developing tank is set up as the central line intersecting point P1. The intersecting point between the shape line of the developing tank buttom plate 11a arranged on the lower part A' of the stirring roll 3 and the shape line of the bottom plate 11a arranged on the under part B' of the roll 5 is set up as the bottom plate intersecting point P2. The shape of the developing tank 11a is set up so that the central line intersecting point P1 is positioned on the stirring roll 3 side from the bottom plate intersecting point P2. Thereby, the developer 2 is attracted to the surface of the sleeve 1 by fixed magnets S3, N2 in the developing roll 5. A part of the developer 2 is regulated by a doctor 9, but the residual forms a magnetic brush on the surface of the sleeve 51 to stick toner toner to the surface of a photosensitive drum 6 on the position of a fixed magnet N1.

Description

【発明の詳細な説明】 (al産業上の利用分野 この発明は、固定磁石の周囲に設けたスリーブを回転駆
動させて磁気ブラシを形成することにより感光体ドラム
表面に現像剤を付着させる現像装置に関する。
Detailed Description of the Invention (Al Industrial Field of Application) This invention relates to a developing device that attaches developer to the surface of a photoreceptor drum by rotationally driving a sleeve provided around a fixed magnet to form a magnetic brush. Regarding.

(b)従来の技術 第2図は従来の現像装置の一例の概略構成を示した図で
ある。
(b) Prior Art FIG. 2 is a diagram showing a schematic configuration of an example of a conventional developing device.

現像槽lの内部には樹脂等からなるトナーと鉄粉等から
なるキャリアとから構成される現像剤2が充填され、攪
拌ローラ3,4によって均一に攪拌される。現像ローラ
5は感光体ドラム6に対向して配設されており、外周に
は反時計方向に回転可能な円筒状のスリーブ51、内部
には放射状に配設された5つの固定磁石33.N2.3
1.N1、S2を有し、固定磁石S3.N2.St、N
1、S2によりスリーブ51の表面に現像剤2を吸着し
磁気ブラシを形成するとともに、スリーブ51の回転に
よりスリーブ5Iに沿ってその現像剤2を搬送する。こ
のようにして搬送されながら現像剤2は感光体ドラム6
にトナーを付着させる、固定磁石S2と固定磁石S3と
の間は他の固定磁石間開土間よりも広くなっていて、こ
の間の磁力強度が弱くなっている。このため、この固定
磁石82〜83間で前記現像剤2がスリーブ51表面か
ら解放される。そこで、一般にはこの82〜83間のこ
とを解散権Fと呼んでいる。解散権Fは現像ローラ全体
の磁力バランス上発生するもので、解散権Fの中でもS
2と83の中心が一番磁力強度が強い。このため、解散
権Fの中心近傍では現像剤が停滞し易くなっている。
The developer tank 1 is filled with a developer 2 composed of toner made of resin or the like and carrier made of iron powder or the like, and is uniformly stirred by stirring rollers 3 and 4. The developing roller 5 is disposed facing the photosensitive drum 6, has a cylindrical sleeve 51 rotatable counterclockwise on its outer periphery, and five fixed magnets 33 arranged radially inside. N2.3
1. N1, S2, and fixed magnets S3. N2. St,N
1. In S2, the developer 2 is attracted to the surface of the sleeve 51 to form a magnetic brush, and the rotation of the sleeve 51 transports the developer 2 along the sleeve 5I. While being conveyed in this way, the developer 2 is transferred to the photosensitive drum 6.
The space between the fixed magnet S2 and the fixed magnet S3, to which the toner is attached, is wider than the open space between the other fixed magnets, and the magnetic force strength therebetween is weaker. Therefore, the developer 2 is released from the surface of the sleeve 51 between the fixed magnets 82 and 83. Therefore, the period between 82 and 83 is generally referred to as the right of dissolution F. The right of dissolution F occurs due to the magnetic balance of the entire developing roller, and among the right of dissolution F, S
The center of numbers 2 and 83 has the strongest magnetic force. For this reason, the developer tends to stagnate near the center of the dissolution right F.

一方、通常現像槽1の底板1aの形状は攪拌ローラ3,
4や現像ローラ5の形状に合わせて構成されている。た
とえば、第2図中Aで示した攪拌ローラ3の下方部分の
現像槽底板1aの形状は攪拌ローラ3の形状に合わせて
構成され、同図中Bで示した現像ローラ5の下方部分の
現像槽底板1aの形状は現像ローラ5の形状に合わせて
構成されている。
On the other hand, the shape of the bottom plate 1a of the developer tank 1 is usually that of the stirring roller 3,
4 and the shape of the developing roller 5. For example, the shape of the developing tank bottom plate 1a in the lower part of the stirring roller 3 indicated by A in FIG. The shape of the tank bottom plate 1a is configured to match the shape of the developing roller 5.

(C1発明が解決しようとする問題点 上述したような現像装置において、現像ローラ中央から
放射線状に延び、前記解散権Fの中心を通過する中心線
Cと、現像槽底板1aとの交点を中心線交差点P1とす
る。また、攪拌ローラ3の下方部分Aの現像槽底板1a
の形状線と、現像ローラ5の下方部分Bの現像槽底板1
aの形状線との交点を底板交差点P2とする。現像槽底
板1aが現像ローラ5や攪拌ローラ3に合わせて構成さ
れているため、底板交差点P2は上方に突出している。
(C1 Problem to be Solved by the Invention In the above-described developing device, the center line C extending radially from the center of the developing roller and passing through the center of the right of dissolution F and the developing tank bottom plate 1a is the center of the problem. The line intersection is P1. Also, the bottom plate 1a of the developer tank in the lower part A of the stirring roller 3
and the developing tank bottom plate 1 of the lower part B of the developing roller 5.
Let the intersection of a with the shape line be a bottom plate intersection P2. Since the developer tank bottom plate 1a is configured to match the developing roller 5 and the stirring roller 3, the bottom plate intersection point P2 projects upward.

上述の現像装置では、スリーブ51から解放された現像
剤2は感光体ドラム6にトナーを付着させてトナー濃度
が低下している。このため、この現像剤2をトナーホッ
パ7から補給されるトナーと撹拌・混合してトナー濃度
を所定値に保持する、したがって、スリーブ51から解
放された現像剤2は攪拌ローラ3.4によって撹拌され
なければならない。ところが、従来の現像装置では攪拌
ローラ3や現像ローラ5に合わせて現像槽底板laの形
状を構成していたため、中心線交差点P1が底板交差点
P2よりも現像ローラ側に位置していた。解散権Fの中
心近傍では現像剤が停滞し易いうえに解放された現像剤
2が、突出形状の底板交差点P2により邪魔されて撹拌
ローラ3側に流動しにくくなり、現像剤2が現像ローラ
の下方部分Bで滞ってしまったり、現像槽lの感光体ド
ラム6側の開口部から外部へ飛散してしまうことがあっ
た。また、現像ローラ下方部Bに滞った現像剤2により
現像ローラ5の駆動トルクが増大してしまう欠点があっ
た。
In the above-described developing device, the developer 2 released from the sleeve 51 adheres toner to the photoreceptor drum 6, resulting in a decrease in toner density. Therefore, the developer 2 is stirred and mixed with the toner supplied from the toner hopper 7 to maintain the toner concentration at a predetermined value. Therefore, the developer 2 released from the sleeve 51 is stirred by the stirring roller 3.4. There must be. However, in the conventional developing device, the shape of the developer tank bottom plate la was configured to match the stirring roller 3 and the developing roller 5, so the centerline intersection P1 was located closer to the developing roller than the bottom plate intersection P2. The developer tends to stagnate near the center of the right of dissolution F, and the released developer 2 is obstructed by the protruding bottom plate intersection P2, making it difficult for the developer to flow toward the stirring roller 3. The toner may get stuck in the lower part B or may scatter to the outside from the opening on the side of the photoreceptor drum 6 of the developing tank I. Further, there is a drawback that the driving torque of the developing roller 5 increases due to the developer 2 stuck in the lower part B of the developing roller.

この発明は、解散権でスリーブ表面から解放された現像
剤を速やかに攪拌ローラ側へ流動させることにより、現
像剤の飛散を防止して駆動トルクを軽減させることがで
きる現像装置を提供することを目的とする。
It is an object of the present invention to provide a developing device that can prevent the developer from scattering and reduce the driving torque by causing the developer released from the sleeve surface by the dissolution right to flow quickly toward the stirring roller. purpose.

(d1問題点を解決するための手段 この発明は、固定磁石の周囲に回転駆動されるスリーブ
を備えた現像ローラと、この現像ローラの感光体ドラム
と反対側の位置に配置された攪拌ローラとを備え、前記
現像ローラが現像ローラ下方で現像剤をスリーブ表面か
ら解放する解散権とを有する現像装置において、 前記解散権の中心を通過する現像ローラの中心線と現像
槽底板との交点である中心線交差点が、現像ローラ下方
の現像槽底板の形状線と攪拌ローラ下方の現像槽底板の
形状線との交点である底板交差点よりも、撹拌ローラ側
に位置するように現像槽底板形状を設定したことを特徴
とする。
(Means for Solving Problem d1) This invention includes a developing roller equipped with a sleeve that is rotationally driven around a fixed magnet, and an agitation roller disposed on the opposite side of the developing roller from the photoreceptor drum. In the developing device, the developing roller has a dissolving right that releases the developer from the sleeve surface below the developing roller, where the center line of the developing roller passing through the center of the dissolving right and the bottom plate of the developer tank intersect. The shape of the developer tank bottom plate is set so that the center line intersection is located closer to the stirring roller than the bottom plate intersection, which is the intersection of the shape line of the developer tank bottom plate below the developing roller and the shape line of the developer tank bottom plate below the stirring roller. It is characterized by what it did.

(e)作用 スリーブ表面に形成された磁気ブラシは感光体ドラムに
トナーを付着させた後、解散権まで搬送され、解散権で
スリーブ表面から解放される。この解散権の中でも中心
の磁力強度が一番強い為、ここで現像剤が停滞する確率
が高い。
(e) Operation After the magnetic brush formed on the surface of the sleeve adheres toner to the photoreceptor drum, it is conveyed to the dissolution right and is released from the sleeve surface at the dissolution right. Since the magnetic force at the center is the strongest among these dissolution rights, there is a high probability that the developer will stagnate here.

この発明においては、前記解散権の中心を通過する中心
線と現像槽底板との交点である中心線交差点が、現像ロ
ーラ下方の現像槽底板の形状線と攪拌ローラ下方の下方
の現像槽底板の形状線との交点である底板交差点よりも
攪拌ローラ側に位置するように、現像槽底板の形状を設
定している。
In this invention, the center line intersection, which is the intersection of the center line passing through the center of the right of dissolution and the bottom plate of the developer tank, is the intersection of the shape line of the bottom plate of the developer tank below the developing roller and the bottom plate of the developer tank below the stirring roller. The shape of the developer tank bottom plate is set so that it is located closer to the stirring roller than the bottom plate intersection, which is the intersection with the shape line.

このため、前記解散権の中心近傍で解放された現像側は
現像槽底板に突出した底板交差点に邪魔されることなく
攪拌ローラ側に流動する。
Therefore, the developer side released near the center of the dissolution right flows toward the stirring roller without being obstructed by the bottom plate intersection protruding from the bottom plate of the developer tank.

(f)実施例 第1図はこの発明の実施例である現像装置の概略構成図
である。はとんどが前述した従来の現像装置の構成と同
じであり、相違点は現像槽の現像槽底板の形状だけであ
る。第2図に示した従来の現像装置と同一部分は同一番
号で示す。
(f) Embodiment FIG. 1 is a schematic diagram of a developing device according to an embodiment of the present invention. The structure is mostly the same as that of the conventional developing device described above, and the only difference is the shape of the bottom plate of the developing tank. The same parts as the conventional developing device shown in FIG. 2 are designated by the same numbers.

現像槽1)の内部には攪拌ローラ3.4と現像ローラ5
とが配設され、現像剤2が充填されている。現像ローラ
5は感光体ドラム6と対向して配設され、攪拌ローラ3
,4は現像ローラ5に対して感光体ドラム60反対側に
配設されている。第2図に示した現像ローラと同様に5
つの固定磁石S3.N2.SL、N1.S2の周囲にス
リーブ51を設けている。現像ローラ5の上方には現像
槽1)内部のトナー濃度を検出するトナー濃度センサ8
や、スリーブ51表面の現像剤2量を規制するドクタ9
が配設されている。トナーホッパ7にはトナー補給ロー
ラ71が設けられ、トナー濃度センサ8が検出する値が
所定値よりも低いときに回転して、現像槽1)ヘトナー
を補給する。
A stirring roller 3.4 and a developing roller 5 are installed inside the developing tank 1).
and is filled with developer 2. The developing roller 5 is disposed facing the photoreceptor drum 6, and the stirring roller 3
, 4 are arranged on the opposite side of the photosensitive drum 60 with respect to the developing roller 5. 5 in the same way as the developing roller shown in Figure 2.
one fixed magnet S3. N2. SL, N1. A sleeve 51 is provided around S2. Above the developing roller 5 is a toner concentration sensor 8 that detects the toner concentration inside the developing tank 1).
and a doctor 9 that regulates the amount of developer on the surface of the sleeve 51.
is installed. The toner hopper 7 is provided with a toner replenishment roller 71, which rotates when the value detected by the toner concentration sensor 8 is lower than a predetermined value to replenish toner to the developer tank 1).

この現像装置において、現像ローラから放射線状に延び
、前記解散権Fの中心を通過する中心線Cと、現像槽底
板1)aとの交点を中心線交差点PLとする。また、攪
拌ローラ3の下方部分A′の現像槽底板1)aの形状線
と、現像ローラ5の下方部分B′の現像槽底板1)aの
形状線との交点を底板交差点P2とする。そして、中心
線交差点P1が底板交差点P2よりも攪拌ローラ3側に
なるように現像槽底板1)aの形状を設定している。
In this developing device, the intersection point between a center line C extending radially from the developing roller and passing through the center of the dissolution right F and the developer tank bottom plate 1) a is defined as a center line intersection PL. Further, the intersection point between the shape line of the developer tank bottom plate 1)a of the lower part A' of the stirring roller 3 and the shape line of the developer tank bottom plate 1)a of the lower part B' of the developing roller 5 is defined as a bottom plate intersection point P2. The shape of the developer tank bottom plate 1)a is set so that the center line intersection P1 is closer to the stirring roller 3 than the bottom plate intersection P2.

以上のように構成することにより、現像ローラ5内部の
固定磁石S3.N2によってスリーブ51の表面に現像
剤2が吸着される。この現像剤2の一部はドクタ9によ
り規制されるが、残りはスリーブ51の表面に磁気ブラ
シを形成し、固定磁石Nlの位置で感光体ドラム6にト
ナーを付着させる。これによってトナーの濃度が低下し
た現像剤2は解散権Fでスリーブ51から解放される。
With the above configuration, the fixed magnet S3 inside the developing roller 5. The developer 2 is adsorbed onto the surface of the sleeve 51 by N2. A part of the developer 2 is regulated by the doctor 9, and the rest forms a magnetic brush on the surface of the sleeve 51, and the toner is attached to the photoreceptor drum 6 at the position of the fixed magnet Nl. As a result, the developer 2 whose toner concentration has decreased is released from the sleeve 51 by the dissolution right F.

このとき、解散権Fの中心は解散権Fの中でも比較的磁
力強度が強いため、現像剤2の流れがスムースでないと
この位置で現像剤2が停滞しやすいが、本実施例の現像
槽底板1)aは中心線交差点P1が底板交差点P2より
も攪拌ローラ3側になるように構成されているため、解
散権Fの現像剤形状に沿って攪拌ローラ3側へ流動する
。そしてこの現像剤2は攪拌ローラ3および4によって
トナーホッパ7から補給されたトナーと攪拌・混合され
、所定のトナー濃度になる。
At this time, since the center of the dissolution right F has a relatively strong magnetic force among the dissolution rights F, the developer 2 tends to stagnate at this position unless the flow of the developer 2 is smooth.However, in this embodiment, the developer tank bottom plate 1) Since a is configured such that the center line intersection P1 is closer to the stirring roller 3 than the bottom plate intersection P2, the developer flows toward the stirring roller 3 along the shape of the dissolution right F. The developer 2 is then stirred and mixed with the toner supplied from the toner hopper 7 by stirring rollers 3 and 4 to reach a predetermined toner concentration.

このようにして、解散権Fでスリーブ51表面から解放
された現像剤2が、突出した底板交差点P2に邪魔され
ることなく攪拌ローラ3側へ流動するため、現像剤2が
現像ローラ下方部Bで滞ってしまうことがない。
In this way, the developer 2 released from the surface of the sleeve 51 by the dissolution right F flows toward the stirring roller 3 side without being obstructed by the protruding bottom plate intersection point P2, so that the developer 2 is transferred to the lower part B of the developing roller. I never get stuck.

(g1発明の効果 この発明によれば、現像ローラの解散権を通過する現像
ローラの中心線と現像槽底板との交点である中心線交差
点が、現像ローラ下方の現像槽底板の形状線と攪拌ロー
ラ下方現像槽底板形状線との交点である底板交差点より
も撹拌ローラ側に位置するように設定されているため、
スリーブから解放された現像剤が底板交差点に邪魔され
ることなく攪拌ローラ側へ流動する。このため、現像剤
が現像ローラ下方で滞ってしまうことがなくなり、現像
槽の開口部から現像剤が飛散してしまったり、現像ロー
ラの駆動トルクが増大してしまうことがなくなる。
(g1 Effect of the invention According to this invention, the center line intersection, which is the intersection of the center line of the developing roller passing through the right of dissolution of the developing roller and the bottom plate of the developing tank, is connected to the shape line of the bottom plate of the developing tank below the developing roller. Because it is set to be located closer to the stirring roller than the bottom plate intersection, which is the intersection with the bottom plate shape line of the lower developer tank,
The developer released from the sleeve flows toward the stirring roller without being obstructed by the intersection of the bottom plate. This prevents the developer from being stagnated below the developing roller, preventing the developer from scattering from the opening of the developer tank, and preventing the driving torque of the developing roller from increasing.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図はこの発明の実施例である現像装置の概略構成図
、第2図は従来の現像装置の概略構成図である。 3.4−攪拌ローラ、 5−現像ローラ、 1)a−現像槽底板、 51−スリーブ、 Sl、N2.N3.N1.N2−固定磁石、F−解散権
、 A′−攪拌ローラ下方部、 B′−現像ローラ下方部。
FIG. 1 is a schematic diagram of a developing device according to an embodiment of the present invention, and FIG. 2 is a schematic diagram of a conventional developing device. 3.4-Agitating roller, 5-Developing roller, 1) a-Developer tank bottom plate, 51-Sleeve, Sl, N2. N3. N1. N2 - fixed magnet, F - dissolution right, A' - lower part of stirring roller, B' - lower part of developing roller.

Claims (1)

【特許請求の範囲】[Claims] (1)固定磁石の周囲に回転駆動されるスリーブを備え
た現像ローラと、この現像ローラの感光体ドラムと反対
側の位置に配置された攪拌ローラとを備え、前記現像ロ
ーラが現像ローラ下方で現像剤をスリーブ表面から解放
する解放極を有する現像装置において、 前記解放極の中心を通過する現像ローラの中心線と現像
槽底板との交点である中心線交差点が、現像ローラ下方
の現像槽底板の形状線と撹拌ローラ下方の現像槽底板の
形状線との交点である底板交差点よりも、撹拌ローラ側
に位置するように現像槽の底板形状を設定したことを特
徴とする現像装置。
(1) A developing roller equipped with a sleeve rotatably driven around a fixed magnet, and an agitation roller disposed at a position opposite to the photosensitive drum of this developing roller, wherein the developing roller is located below the developing roller. In a developing device having a release pole that releases the developer from the sleeve surface, a center line intersection, which is an intersection between a center line of the developing roller passing through the center of the release pole and the developer tank bottom plate, is located at the developer tank bottom plate below the developing roller. A developing device characterized in that the shape of the bottom plate of the developer tank is set to be located closer to the stirring roller than the bottom plate intersection, which is the intersection of the shape line of the developer tank and the shape line of the bottom plate of the developer tank below the stirring roller.
JP23888986A 1986-10-07 1986-10-07 Developing device Pending JPS6392976A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23888986A JPS6392976A (en) 1986-10-07 1986-10-07 Developing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23888986A JPS6392976A (en) 1986-10-07 1986-10-07 Developing device

Publications (1)

Publication Number Publication Date
JPS6392976A true JPS6392976A (en) 1988-04-23

Family

ID=17036773

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23888986A Pending JPS6392976A (en) 1986-10-07 1986-10-07 Developing device

Country Status (1)

Country Link
JP (1) JPS6392976A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8238801B2 (en) * 2008-03-18 2012-08-07 Ricoh Company, Limited Developing device, process cartridge, method and image forming apparatus for developing an electrostatic latent image on an image carrier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8238801B2 (en) * 2008-03-18 2012-08-07 Ricoh Company, Limited Developing device, process cartridge, method and image forming apparatus for developing an electrostatic latent image on an image carrier

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